Caldera UK officially released Caldera OpenDOS 7.01 in February 1997, but this version was just Novell DOS 7 update 10 (as of December 1994) with a new name, missing a year's worth of patches which had been developed for the Novell DOS updates 11 (January 1995) to 15.2 (January 1996). This was due to parts of the Novell DOS sources having been lost at Novell meanwhile. Consequently, this version still reported an internal BDOS version of 7.2, identical to Novell DOS 7. The new suite also lacked the SETFIFO command, which had been added with one of the Novell DOS updates, as well as Fifth Generation's Search&Destroy virus scanner and FastBack Plus 2.0 utility, which previously came bundled with Novell DOS. Instead it brought an advanced version of NetWars.
Parts of OpenDOS 7.01 were released as open source in form of the M.R.S. kit (for Machine Readable Sources) in May 1997, but with license terms mostly incompatible with existing open source licenses. The source was then closed again as Gross felt this would undermine the commercial aspirations of the system. --Wikipedia